Saw-tooth.



J. W. DUNN &; H. J. RANDALL.

SAW TOOTH.

APPLICATION. FILED MAR. 5,1909.l

@Hummm ANDREW. s, nimma co.. PMoTo-LITMQGEAPHERS. wAsmNmnN n c UNITEDSTATES PATENT OFFICE.

JOHN W. DUNN AND HERMAN J'. RANDALL, OF ALGER., MICHIGAN.

SAW-TOOTH.

To all 'whom 'it 'may concern:

Be it known that we, JOHN lV. DUNN and HERMAN J. RAN DALL, citizens ofthe United States, residing at Alger, in the county of Arenac, State ofMichigan, have invented certain new and useful improvements in gSaw-Teeth; and we do hereby declare -the l following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

This invention relates to saws and more especially to a novel forni ofsaw tooth.

he principal object of the invention is to provided an improved form ofteeth for the ordinary handsaw which will readily clear themselveswithout making it necessary to forni the saw with a separate type ofclearer teeth.

The invention further consists in certain novel details of constructionand combinations of parts hereinafter fully described, illustrated inthe accompanying drawings, and specilically set forth in the claims.

ln the accompanying drawings like characters of reference indicate likeparts in the several views, and Figure l is a side elevation of aportion of a saw blade constructed in accordance with this invention.Fig. 2 is a section on the line 2 2 of Fig. l. Fig. 3 is an edge view ofseveral of the teeth.

Numeral l() indicates the body of the blade and this body is providedwith a series of teeth ll of ordinary forni common in handsaws, that isto say, these teeth are substantially triangular in shape and providedwith beveled faces.

Considering the teeth as divided into sets of two, between each of saidsets is a groove 12 which is preferably triangular in cross section, oneedge of the groove beginning at substantially half way down the side ofone tooth and extending perpendicular to the cutting faces of the saw,while the other edge of the groove extends substantially from the pointof the neXt adjacent tooth and rakes backward to intersect thefirstmentioned edge, thereby forniing a groove Specification of LettersPatent.

Application filed March 6, 1909.

which is deepest at thel cutting edge and Patented Nov. 16, 1909.

Serial No. 481,590.

which gradually merges into the face of the body l0. The grooves as thusarranged are spaced a distance apart equal to the space of two teeth andthese grooves are formed on each side of the saw, the grooves on 011eside being in staggered relation to the grooves on the opposite side.Experience has shown that there has thus been provided a highlyetiicient form of saw tooth which has eX- tremely rapid cuttingqualities and which clears itself from the chips in a superior manner.Furthermore, this form of toot-h not only cuts rapidly but the groovesact to plane the cut surface and leave the cut in a perfectly smoothcondition.

Having thus described the invention, what is claimed as new, is

l. A saw provided with a series of equiform and equispaced teeth andhaving a series of grooves upon each side of the blade dividing theteeth in sets of two on each side, the grooves upon one side being instaggered relation to the grooves upon the opposite side of the blade.

2. A saw provided with a series of equiform and equispaced teeth andhaving a series of grooves upon each side of the blade dividing theteeth in sets of two on each side, the grooves upon one side being instaggered relation to the grooves upon the opposite side of the blade,said grooves being substantially triangular in cross section.

3. A saw provided with a series of equiform and equispaced teeth andhaving a series of grooves upon each side ot the blade dividing theteeth in sets of two on each side, the grooves upon one side being instaggered relation to the grooves upon the opposite side of the blade,said grooves being substantially triangular in cross section andtapering from the teeth toward the back of the blade.

In testimony whereof, we affix our signatures in presence of twowitnesses.

JOHN WV. DUNN. HERMAN J. RANDALL. Witnesses:

NELSON IRELAND, SCOTT ClLLEY.

